/**
 * Additional list adapter so that we can display headers in lists. Code
 * borrowed from http://jsharkey.org/blog/2008/08/18/separating-lists-with-headers-in-android-09/  
 */

package edu.washington.cs.labspecimentransport.adapters;

import java.util.LinkedHashMap;
import java.util.Map;

import edu.washington.cs.labspecimentransport.R;
import edu.washington.cs.labspecimentransport.R.layout;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;

public class SeparatedListAdapter extends BaseAdapter {
	public final Map<String,Adapter> sections = new LinkedHashMap<String,Adapter>();  
	public final ArrayAdapter<String> headers;  
	public final static int TYPE_SECTION_HEADER = 0;  

	public SeparatedListAdapter(Context context) {  
		headers = new ArrayAdapter<String>(context, R.layout.client_single_header);  
	}  

	public void addSection(String section, Adapter adapter) {  
		this.headers.add(section);  
		this.sections.put(section, adapter);  
	}  

	public Object getItem(int position) {  
		for(Object section : this.sections.keySet()) {  
			Adapter adapter = sections.get(section);  
			int size = adapter.getCount() + 1;  

			// check if position inside this section  
			if(position == 0) return section;  
			if(position < size) return adapter.getItem(position - 1);  

			// otherwise jump into next section  
			position -= size;  
		}  
		return null;  
	}  

	public int getCount() {  
		// total together all sections, plus one for each section header  
		int total = 0;  
		for(Adapter adapter : this.sections.values())  
			total += adapter.getCount() + 1;  
		return total;  
	}  

	public int getViewTypeCount() {  
		// assume that headers count as one, then total all sections  
		int total = 1;  
		for(Adapter adapter : this.sections.values())  
			total += adapter.getViewTypeCount();  
		return total;  
	}  

	public int getItemViewType(int position) {  
		int type = 1;  
		for(Object section : this.sections.keySet()) {  
			Adapter adapter = sections.get(section);  
			int size = adapter.getCount() + 1;  

			// check if position inside this section  
			if(position == 0) return TYPE_SECTION_HEADER;  
			if(position < size) return type + adapter.getItemViewType(position - 1);  

			// otherwise jump into next section  
			position -= size;  
			type += adapter.getViewTypeCount();  
		}  
		return -1;  
	}  

	public boolean areAllItemsSelectable() {  
		return false;  
	}  

	public boolean isEnabled(int position) {  
		return (getItemViewType(position) != TYPE_SECTION_HEADER);  
	}  

	public View getView(int position, View convertView, ViewGroup parent) {  
		int sectionnum = 0;  
		for(Object section : this.sections.keySet()) {  
			Adapter adapter = sections.get(section);  
			int size = adapter.getCount() + 1;  

			// check if position inside this section  
			if(position == 0) return headers.getView(sectionnum, convertView, parent);  
			if(position < size) return adapter.getView(position - 1, convertView, parent);  

			// otherwise jump into next section  
			position -= size;  
			sectionnum++;  
		}  
		return null;  
	}  

	public long getItemId(int position) {  
		return position;  
	}
}
